JKCET SERIES Physics
Communication Systems
10 previous year questions.
Volume: 10 Ques
Yield: Medium
High-Yield Trend
1
2019 1
2018 2
2017 1
2015 2
2014 1
2012 2
2011 Chapter Questions 10 MCQs
01
PYQ 2011
medium
physics ID: jkcet-20
A TV tower has a height 150 m. What is the total population covered by the TV tower, if the population density around the TV tower is Radius of the earth is
1
60.288 lakh
2
40.192 lakh
3
100 lakh
4
20.22 lakh
02
PYQ 2011
medium
physics ID: jkcet-20
What fraction of the surface area of earth can be covered to establish communication by one geostationary statellite?
1
2
3
4
03
PYQ 2012
medium
physics ID: jkcet-20
In television transmission what type of modulation is used ?
1
Only amplitude modulation
2
Only frequency modulation
3
Both amplitude and frequency modulation
4
TV signal does not need any kind of modulation
04
PYQ 2014
medium
physics ID: jkcet-20
In a video signal for transmission of picture, what value of bandwidth is used in communication system?
1
2
3
4
05
PYQ 2014
medium
physics ID: jkcet-20
The waves used for line-of-sight communication is
1
ground waves
2
space waves
3
soundwaves
4
sky waves
06
PYQ 2015
medium
physics ID: jkcet-20
Which of the following is incorrect about sky waves?
1
Sky waves are not used in long distance communication
2
Their propagation takes place by total internal reflection
3
Sky waves support the so-called AM band
4
The frequency of sky waves ranges typically from 3 MHz to 30 MHz
07
PYQ 2017
medium
physics ID: jkcet-20
Which of the following is the indirect way of generating ?
1
Reactance modulator
2
Varactor diode modulator
3
Armstrong modulator
4
Reactance bipolar transistor modulator
08
PYQ 2017
easy
physics ID: jkcet-20
Amplitude modulation is the process of
1
superimposing a high frequency signal on a low frequency carrier signal
2
superimposing a low frequency signal on a high frequency carrier signal
3
single-sideband communication
4
amplitude shift and phase shift
09
PYQ 2018
medium
physics ID: jkcet-20
What modulation index and side bands are produced when a message of frequency and peak voltage of volts is used to modulate a carrier frequency of and peak voltage of 20 volts ?
1
Modulation index is . The side bands are
2
Modulation index is . The side bands are
3
Modulation index is . The side bands are
4
Modulation index is . The side bands are
10
PYQ 2019
medium
physics ID: jkcet-20
A carrier wave is modulated by an audio signal of frequency range . What is the bandwidth of the channel?
1
2
3
4